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Dimensional crossover and anomalous magnetoresistivity in single crystals $Na_xCoO_2$ | | C. H. Wang
; X. H. Chen
; J. L. Luo
; G. T. Liu
; X. X. Lu
; H. T. Zhang
; G. Y. Wang
; X. G. Luo
; N. L. Wang
; | | Date: |
2 Nov 2004 | | Journal: | Phys. Rev. B 71, 224515 (2005) DOI: 10.1103/PhysRevB.71.224515 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | The in-plane ($
ho_{ab}$) and c-axis ($
ho_c$) resistivities, and the magnetoresistivity of single crystals $Na_xCoO_2$ with x = 0.7, 0.5 and 0.3 were studied systematically. $
ho_{ab}(T)$ shows similar temperature dependence between $Na_{0.3}CoO_2$ and $Na_{0.7}CoO_2$, while $
ho_c(T)$ is quite different. A dimensional crossover from two to three occurs with decreasing Na concentration from 0.7 to 0.3. The angular dependence of in-plane magnetoresistivity for 0.5 sample shows a emph{"d-wave-like"} symmetry at 2K, while the emph{"p-wave-like"} symmetry at 20 K. These results give an evidence for existence of a emph{spin ordering orientation} below 20 K turned by external field, like the stripes in cuprates. | | Source: | arXiv, cond-mat/0411050 | | Services: | Forum | Review | PDF | Favorites | |
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